SWODY2
SPC AC 191707
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1107 AM CST WED NOV 19 2008
VALID 201200Z - 211200Z
...NO SVR TSTM AREAS FORECAST...
...PACIFIC NW...
STRONG SHORTWAVE TROUGH CURRENTLY OVER THE NERN PACIFIC WILL MOVE
INTO THE PACIFIC NW FRIDAY ACCOMPANIED BY A COLD FRONT. STEEP
700-500 MB LAPSE RATES NORTH OF ATTENDANT CYCLONIC UPPER JET MAY
CONTRIBUTE TO SUFFICIENT INSTABILITY FOR ISOLATED LIGHTNING STRIKES
IN POST FRONTAL ZONE DURING THE AFTERNOON.
...GREAT LAKES AREA...
AN UPPER TROUGH WILL AMPLIFY OVER THE OH VALLEY AND GREAT LAKES AS A
LARGE AREA OF CP HIGH PRESSURE ADVANCES THROUGH THE ERN TWO THIRDS
OF THE COUNTRY IN WAKE OF SEWD ADVANCING COLD FRONT. DESTABILIZATION
WILL COMMENCE OVER THE GREAT LAKES IN WAKE OF COLD FRONT.
EQUILIBRIUM LEVELS WILL LIKELY RISE THURSDAY EVENING ESPECIALLY
OVER THE WRN GREAT LAKES AS 700 MB THERMAL TROUGH ADVANCES SEWD. THE
CONVECTIVE LAYER MAY DEEPEN SUFFICIENTLY TO SUPPORT ISOLATED
LIGHTNING STRIKES WITH SOME OF THE LAKE INDUCED BANDS.
..DIAL.. 11/19/2008
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